<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>for循环</title>
</head>
<body>
    <script>
        //循环的初始值    //循环条件    //循环后变量的变化
        for(var i=1;i<=100;i++){
            document.write(i+'<br/>')
        }
    </script>
</body>
</html>